Windshield wiper unit



FIG. 1 is a side view of a windshield wiper unit showing our new design the opposite side being a mirror image;

FIG. 2 is a bottom view thereof;

FIG. 3 is a top view thereof; and,

FIG. 4 is an end view thereof the opposite end being a mirror image. 

The ornamental design for a windshield wiper unit, as shown and described. 